Earth boring drill



April 19, 1932. F. L. scoTT EARTH BORING DRILL Filed March 12. 1929 FLOW L. SCOTT INVENTOR A TTORNEY Patented Apr. 19, 1932 UNITED STATES PATENr orrlcs FLOYD L. SCOTT, OF HOUSTON, TEZAS,'AS8IGHOBTO HUGHES TOOL comm. HOUSTON, TEXAS, A OOBPORQTION OF arms mm. some ma. Application manna 1:, 1m. Serial 161mm.

' My invention relates to drills for drilling wells for water, oil, gas and the like. It

pertains particularly to drills adapted for use in softer types of formation although not weight of the drill stem to rest upon the drill,

for if he does, the drill stem will be bent by the weight above and will b'e seriously damaged.- The driller will, therefore, suspend a portion of the weight of the drill stem from the crown block of the derrick, and allow only a safe load to rest upon the drill.

The drill is driven into the formation being drilled by the weight placed thereon, and sometimes the safe. load which may be used is insufficient to force the blades of thedrill into the formation an amount suflicient to obtain the best results for speedy and economical drilling.

' a drill bit with the smallest practical amount of cutting edge so that the weight resting thereon will be most 'eifective in driving it into the bottom of the well. I'desire to limit a the amount of cutting edge sothatthe available weight will be distributed over a smaller amount of cutting area, and thus obtain greater penetration.

ter uncut; and then to break off and shatter the core projecting up from the well bottom without the necessity of drilling that portion.

The invention resides in the particular construction of the drill whereby these obj ects may be accomplished and in the manner in whichthe hole is drilled.

' Referring to the drawings herewith,

Fig. 1 is a vertical section through a drill of the drill,ras will be noted. from Fig It is an object of my invention to provide I aim to cut the outerarea of the bottom of 1 the well in an annular path, leaving the cell-- embodying my invention, said section being on the plane 1-1 of Fig. 3.

Fig. 2 is a sideelevation of the tool.

' Fig. 3 is a bottom plan view of the same.

The drill'is formed with a head 1 of circular formation but tapering somewhat downwardly. It has a central threaded socket 2 to connect with a drill collar or tool joint 3'fo'r operation.

The head 1s provided with an opening 4 60 through the lower end for flushing fluid. Across this opening are a plurality, preferably three, approximately radial arms or blades 5, joined together centrally. of the opemng and connected with the side rim o the openm' at their outer ends. Said blades are for reaking u the core and are not for drillin The b ades are inclined slightly forwar in the direction of rotation 3 and have the forward side provided with a:

- core engaging edge 6.

The cutters for the drill comprise a plurality of laterally extending blades 7, said blades extend outwardly from the head 1 and project materially in advance of the head. The blades are inclined forwardly in the direction of rotation and the forward side is formed with a vertical cutting edge 8 and a lower cutting edge 9, said lower edge being inclined downwardly as seen in Figs. 1 and 2.

Adjacent the lower ends of the blades, a reinforcing ring 10 connects their inner ed es and the lower cutting edge is extended elow said ring 10 to cut clearance therefor as seen at 11.

said fragments are carried away by the flushing-fluid to the surface.

Practically the entire weight, of the drill may thus rest upon the cutting edges 9 of the blades and the cutters will be more effectively forced to penetrate the formation at the bottom of the hole. The ordinary safewe'ght which may be employed in will us entirely suflicient for economical opera- I What I claim as new is: A rota well drill including a downwardly taper; tubular head, forming an inner tapered socket threaded for connection with a drill stem, cutting blades thereon projecting laterally1 from said head and curved forwardly in t e direction of rotation, said blades extending materially in advance of said head means connecting the forward ends ofsaid blades, and short core breaking 'blades extending inwardly from said cutting blades and joined integrally together adjacent the forward end of said hea In testimony whereof I hereunto afiix m signature this 8th dag of March A. 1)., 1

LOYD L. SCOTT. 

